ob-core: Fix inline results

* lisp/ob-core.el (org-babel-where-is-src-block-result): Find results
for inline src-blocks or inline babel call not located on a subsequent
line, e.g., because of filling.
(org-babel-insert-result): When inline results exist, replace them
in-place.
(org-babel-remove-inline-result): Also remove results not located on the
same line as the source code.
(org-babel-examplify-region): Change signature. Properly mark inline
results at the beginning of a line.
* testing/lisp/test-ob.el (test-ob/inline-src_blk-default-results-replace-line-1):
Add tests.